# Copyright (c) 2018 PaddlePaddle Authors. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

from __future__ import print_function

import unittest
import numpy as np
import paddle.fluid as fluid
from op_test import OpTest


# Correct: General.
class TestUnsqueezeOp(OpTest):
    def setUp(self):
        self.init_test_case()
        self.op_type = "unsqueeze2"
        self.inputs = {"X": np.random.random(self.ori_shape).astype("float64")}
        self.init_attrs()
        self.outputs = {
            "Out": self.inputs["X"].reshape(self.new_shape),
            "XShape": np.random.random(self.ori_shape).astype("float64")
        }

    def test_check_output(self):
        self.check_output(no_check_set=["XShape"])

    def test_check_grad(self):
        self.check_grad(["X"], "Out")

    def init_test_case(self):
        self.ori_shape = (3, 40)
        self.axes = (1, 2)
        self.new_shape = (3, 1, 1, 40)

    def init_attrs(self):
        self.attrs = {"axes": self.axes}


# Correct: Single input index.
class TestUnsqueezeOp1(TestUnsqueezeOp):
    def init_test_case(self):
        self.ori_shape = (3, 5)
        self.axes = (-1, )
        self.new_shape = (3, 5, 1)


# Correct: Mixed input axis.
class TestUnsqueezeOp2(TestUnsqueezeOp):
    def init_test_case(self):
        self.ori_shape = (3, 5)
        self.axes = (0, -1)
        self.new_shape = (1, 3, 5, 1)


# Correct: There is duplicated axis.
class TestUnsqueezeOp3(TestUnsqueezeOp):
    def init_test_case(self):
        self.ori_shape = (3, 2, 5)
        self.axes = (0, 3, 3)
        self.new_shape = (1, 3, 2, 1, 1, 5)


# Correct: Reversed axes.
class TestUnsqueezeOp4(TestUnsqueezeOp):
    def init_test_case(self):
        self.ori_shape = (3, 2, 5)
        self.axes = (3, 1, 1)
        self.new_shape = (3, 1, 1, 2, 5, 1)


# axes is a list(with tensor)
class TestUnsqueezeOp_AxesTensorList(OpTest):
    def setUp(self):
        self.init_test_case()
        self.op_type = "unsqueeze2"

        axes_tensor_list = []
        for index, ele in enumerate(self.axes):
            axes_tensor_list.append(("axes" + str(index), np.ones(
                (1)).astype('int32') * ele))

        self.inputs = {
            "X": np.random.random(self.ori_shape).astype("float64"),
            "AxesTensorList": axes_tensor_list
        }
        self.init_attrs()
        self.outputs = {
            "Out": self.inputs["X"].reshape(self.new_shape),
            "XShape": np.random.random(self.ori_shape).astype("float64")
        }

    def test_check_output(self):
        self.check_output(no_check_set=["XShape"])

    def test_check_grad(self):
        self.check_grad(["X"], "Out")

    def init_test_case(self):
        self.ori_shape = (3, 5)
        self.axes = (1, 2)
        self.new_shape = (3, 1, 1, 5)

    def init_attrs(self):
        self.attrs = {}


class TestUnsqueezeOp1_AxesTensorList(TestUnsqueezeOp_AxesTensorList):
    def init_test_case(self):
        self.ori_shape = (3, 5)
        self.axes = (-1, )
        self.new_shape = (3, 5, 1)


class TestUnsqueezeOp2_AxesTensorList(TestUnsqueezeOp_AxesTensorList):
    def init_test_case(self):
        self.ori_shape = (3, 5)
        self.axes = (0, -1)
        self.new_shape = (1, 3, 5, 1)


class TestUnsqueezeOp3_AxesTensorList(TestUnsqueezeOp_AxesTensorList):
    def init_test_case(self):
        self.ori_shape = (3, 2, 5)
        self.axes = (0, 3, 3)
        self.new_shape = (1, 3, 2, 1, 1, 5)


class TestUnsqueezeOp4_AxesTensorList(TestUnsqueezeOp_AxesTensorList):
    def init_test_case(self):
        self.ori_shape = (3, 2, 5)
        self.axes = (3, 1, 1)
        self.new_shape = (3, 1, 1, 2, 5, 1)


# axes is a Tensor
class TestUnsqueezeOp_AxesTensor(OpTest):
    def setUp(self):
        self.init_test_case()
        self.op_type = "unsqueeze2"

        self.inputs = {
            "X": np.random.random(self.ori_shape).astype("float64"),
            "AxesTensor": np.array(self.axes).astype("int32")
        }
        self.init_attrs()
        self.outputs = {
            "Out": self.inputs["X"].reshape(self.new_shape),
            "XShape": np.random.random(self.ori_shape).astype("float64")
        }

    def test_check_output(self):
        self.check_output(no_check_set=["XShape"])

    def test_check_grad(self):
        self.check_grad(["X"], "Out")

    def init_test_case(self):
        self.ori_shape = (3, 5)
        self.axes = (1, 2)
        self.new_shape = (3, 1, 1, 5)

    def init_attrs(self):
        self.attrs = {}


class TestUnsqueezeOp1_AxesTensor(TestUnsqueezeOp_AxesTensor):
    def init_test_case(self):
        self.ori_shape = (3, 5)
        self.axes = (-1, )
        self.new_shape = (3, 5, 1)


class TestUnsqueezeOp2_AxesTensor(TestUnsqueezeOp_AxesTensor):
    def init_test_case(self):
        self.ori_shape = (3, 5)
        self.axes = (0, -1)
        self.new_shape = (1, 3, 5, 1)


class TestUnsqueezeOp3_AxesTensor(TestUnsqueezeOp_AxesTensor):
    def init_test_case(self):
        self.ori_shape = (3, 2, 5)
        self.axes = (0, 3, 3)
        self.new_shape = (1, 3, 2, 1, 1, 5)


class TestUnsqueezeOp4_AxesTensor(TestUnsqueezeOp_AxesTensor):
    def init_test_case(self):
        self.ori_shape = (3, 2, 5)
        self.axes = (3, 1, 1)
        self.new_shape = (3, 1, 1, 2, 5, 1)


# test api
class TestUnsqueezeAPI(unittest.TestCase):
    def test_api(self):
        input = np.random.random([3, 2, 5]).astype("float64")
        x = fluid.data(name='x', shape=[3, 2, 5], dtype="float64")
        positive_3_int32 = fluid.layers.fill_constant([1], "int32", 3)
        positive_1_int64 = fluid.layers.fill_constant([1], "int64", 1)
        axes_tensor_int32 = fluid.data(
            name='axes_tensor_int32', shape=[3], dtype="int32")
        axes_tensor_int64 = fluid.data(
            name='axes_tensor_int64', shape=[3], dtype="int64")

        out_1 = fluid.layers.unsqueeze(x, axes=[3, 1, 1])
        out_2 = fluid.layers.unsqueeze(
            x, axes=[positive_3_int32, positive_1_int64, 1])
        out_3 = fluid.layers.unsqueeze(x, axes=axes_tensor_int32)
        out_4 = fluid.layers.unsqueeze(x, axes=3)
        out_5 = fluid.layers.unsqueeze(x, axes=axes_tensor_int64)

        exe = fluid.Executor(place=fluid.CPUPlace())
        res_1, res_2, res_3, res_4, res_5 = exe.run(
            fluid.default_main_program(),
            feed={
                "x": input,
                "axes_tensor_int32": np.array([3, 1, 1]).astype("int32"),
                "axes_tensor_int64": np.array([3, 1, 1]).astype("int64")
            },
            fetch_list=[out_1, out_2, out_3, out_4, out_5])

        assert np.array_equal(res_1, input.reshape([3, 1, 1, 2, 5, 1]))
        assert np.array_equal(res_2, input.reshape([3, 1, 1, 2, 5, 1]))
        assert np.array_equal(res_3, input.reshape([3, 1, 1, 2, 5, 1]))
        assert np.array_equal(res_4, input.reshape([3, 2, 5, 1]))
        assert np.array_equal(res_5, input.reshape([3, 1, 1, 2, 5, 1]))

    def test_error(self):
        def test_axes_type():
            x2 = fluid.data(name="x2", shape=[2, 25], dtype="int32")
            fluid.layers.unsqueeze(x2, axes=2.1)

        self.assertRaises(TypeError, test_axes_type)


if __name__ == "__main__":
    unittest.main()